Where will the SD or STATUS page be displayed when the lower DU has failed if you select ECAM/ND XFR switch?

The STATUS page or SD will be displayed on the Non-Digital Unit (NDU) when the lower Display Unit (DU) has failed and the ECAM/ND XFR switch is selected. This configuration is designed to enhance situational awareness by allowing critical system information to be viewed even when one of the primary displays is non-operational.

Selecting the ECAM/ND XFR switch effectively transfers the relevant information typically shown on the lower DU to the NDU, ensuring that flight crew members still have access to essential data despite the failure of a display unit. This redundancy is a critical feature of the A320's avionic system, providing continuous access to important operational status and alerts. Thus, it maintains safety and functionality by transferring the display function even in the event of a display failure.